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  1. #1
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    203f 160r rotors, which adapters

    i am doing my first bike build and have couple questions about rotors. i will have 2012 xt brakes, fox 36 fork, mojo hd frame. which adapters will i need for 203front and 160 rear.
    also, could i use magura storm or magura storm sl rotors instead of shimano rotors?
    thanks

  2. #2
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    You might want to step that rear up to a 185 if you're going 203mm in the front, otherwise you'll have a massively powerful and grippy front rotor to a standard power rear.

    On the adapters, get the one for the size rotor and fork/frame. I'm pretty sure the aggressive Fox forks use a post mount and most bikes use IS on the rear.

  3. #3
    wyrd bi ful rd
    Reputation: chinaman's Avatar
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    The mojo HD frame has PM tabs ...
    Name:  20110721 ibis mojo frame post mount MTBR FORUM.jpg
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    and it is for 160mm rotors, so no adaptors needed.

    The fox 36 has PM tabs as well and so you will need something like this ...
    Name:  20110721 caliper PM mount to fork PM mount 203mm MTBR FORUM.jpg
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Size:  5.3 KB
    which is for 203mm rotors.

    Rotors are generally interchangeable as long as the braking track width and the thickness of the rotor is the same ...

    If you wish to go with a larger rotor in the rear, it may be a bit difficult looking for PM to PM adaptors for the rear as it is not a common design. Someone will prove me wrong ...

    BUT ... I know for a fact that PM to IS mount 203mm for the front, when used in the rear, becomes a 183mm, so this may be so even for a PM to PM mount, and as you have that already, try it in the rear to see if a 183mm rotor will fit ... if you have not got a 183mm rotor, just make one up using a cardboard to see if the front adaptor works in the rear ...

  4. #4
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    Honestly I don't think you'll need the 203mm rotor in front, but meh, that's just me, 160 is more than enough for the rear (if you go for a larger rotor, you'll lock the wheel way to easy), especially with the 2012 xt which has some serious stopping power.
    Yes you can use whatever discs you like, but I'd personally stick with shimano because of the ice tech.

  5. #5
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    thanks, not going anything larger than 160 for rear, thats what i have right now ant it is enough. front i have 160 too and feel like i could use way more , but than i dont know what would be the difference stepping up to 180 or 203 so i figured i would go bigger.
    is ice tech basically ss rotor with alum spider? not sure how much improvement will it bring but it costs 3 times the regular rotor. not sure if its worth extra $$.

  6. #6
    Bike to the Bone...
    Reputation: rzozaya1969's Avatar
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    My current setup is Magura Louises with 203 front / 160 rear. I really think this is a great combo. I'm around 230-240 lbs plus gear and do sort of all mountain bike with push-a-bike sections, but so far this combo has worked great. I've also done this setup (203/160) with Shimano XT (2005 model) and still feel the same, it works great, no need for 180 rear (I tried 180 rear, and it was a little bit too much for the rear, easy to lock the rear brake if not carefull).

  7. #7
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    ice tech discs are made like a sandwich with an aluminum piece in the middle which helps dissipate the heat better, also that means less or no fading at all.

  8. #8
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    does it have to be specifically shimano brand?

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